But these helicopters are meant for the heavy lift role and not for tactical roles, that's only a PR argument from Boeing, but this role is done by Mi 17s in IAF and the huge orders confirms that they are more than happy with them. This competition is only for 15 x heavy transport helicopters and when transporting cargo, vehicles, troops it the requirement, the Chinook is not even close to be comparable to the Mi 26. That's why even the US forces use Ch 53 in this heavier role!
If IAF wants helicopters to improve the tactical role next to Mi 17s, CV 22s would make much more sense than Chinooks. So all in all, it's not the best choice for IAF, but since Ch 53s seems not to be in the competition anymore and if the Russians remain with the maintenance issues, it will have a chance to win, otherwise it hasn't.
Btw, you are mistaken about Russians losing out, just check the numbers of Mi 17, additional Su 30s, Mig 29s, or Phalcon AWACS that again comes with A50 platforms (let alone MRTA and FGFA numbers in future) and you will see a clear difference. US aircrafts comes in in smaller numbers and only in specialised roles so far, where they advanced techs and capabilities would be a good addition to IAF, one reason why the Apache was always the front runner.
You might want to check what the current Mi 26 was used for in operational service in IAF and might compare if the Chinook can do the same!
So the operational use is a clear point FOR and not against the Mi 26, only the maintenance was an issue, but this modernised version is by far different, so it ends up with, will Mil improve their after sale support or can we build parts of it in India to make sure maintenance is secured.